نتایج جستجو برای: organic product

تعداد نتایج: 471450  

Journal: :Journal of the American Chemical Society 2008
Elena Sartori Marco Ruzzi Ronald G Lawler Nicholas J Turro

The kinetics of para-ortho conversion and nuclear spin relaxation of H 2 in chloroform- d 1 were investigated in the presence of nitroxides as paramagnetic catalysts. The back conversion from para-hydrogen ( p-H 2) to ortho-hydrogen ( o-H 2) was followed by NMR by recording the increase in the intensity of the signal of o-H 2 at regular intervals of time. The nitroxides proved to be hundreds of...

Journal: :Journal of the American Chemical Society 2006
Elena Sartori Marco Ruzzi Nicholas J Turro John D Decatur David C Doetschman Ronald G Lawler Anatoly L Buchachenko Yasujiro Murata Koichi Komatsu

The 1H nuclear spin-lattice relaxation time (T1) of H2 and H2@C60 in organic solvents varies with solvent, and it varies proportionally for H2 and for H2@C60. Since intermolecular magnetic interactions are ruled out, the solvent must influence the modulating processes of the relaxation mechanisms of H2 both in the solvent cage and inside C60. The temperature dependence of T1 also is very simila...

Journal: :Chemical communications 2011
Xiangyou Li Hongqiang Wang Yoshiki Shimizu Alexander Pyatenko Kenji Kawaguchi Naoto Koshizaki

A simple approach to prepare carbon quantum dots is presented in this communication by laser rapid passivation of nano carbon particles in ordinary organic solvent. The as-prepared carbon dots exhibited visible, tunable and stable photoluminescence (PL). XPS analysis showed that the increased oxygen concentration might be concerned with the origin of PL.

2015
Ana Caroline Lustosa de Melo Carvalho Thiago de Sousa Fonseca Marcos Carlos de Mattos Maria da Conceição Ferreira de Oliveira Telma Leda Gomes de Lemos Francesco Molinari Diego Romano Immacolata Serra Vladimír Křen

Biocatalysis offers an alternative approach to conventional chemical processes for the production of single-isomer chiral drugs. Lipases are one of the most used enzymes in the synthesis of enantiomerically pure intermediates. The use of this type of enzyme is mainly due to the characteristics of their regio-, chemo- and enantioselectivity in the resolution process of racemates, without the use...

Journal: :Dalton transactions 2010
Cécilia A Citadelle Erwan Le Nouy Fabrice Bisaro Alexandra M Z Slawin Catherine S J Cazin

A novel synthetic route leading to N-heterocyclic carbene copper complexes has been developed by using air-stable and commercially available copper(I) oxide and imidazolium salts starting materials.

Journal: :Indian journal of experimental biology 2004
Prema Gurumurthy T N Gayathri S Bhagavathy P Venkatesan

A simple column chromatographic method for determination of ethambutol (EMB) in pharmaceutical preparations containing EMB in combination with other anti-TB drugs is presented. The method involved extraction of EMB into an organic solvent, followed by basification and column chromatographic separation on Amberlite CG 50 (100-200 mesh) and elution with suitable eluants and estimation at a wavele...

Journal: :Advanced materials 2015
Sanghyuk Wooh Hannah Huesmann Muhammad Nawaz Tahir Maxime Paven Kristina Wichmann Doris Vollmer Wolfgang Tremel Periklis Papadopoulos Hans-Jürgen Butt

A method for mesoporous supraparticle synthesis on superamphiphobic surfaces is designed. Therefore, supraparticles assembled with nanoparticles are synthesized by the evaporation of nanoparticle dispersion drops on the superamphiphobic surface. For synthesis, no further purification is required and no organic solvents are wasted. Moreover, by changing the conditions such as drop size and conce...

2005
Lee Suan Chua Mohamad Roji Sarmidi

The enzymatic resolution of (R, S)-1-phenylethanol was carried out in various organic solvents. Two commercial immobilized lipases, such as ChiroCLEC-PC and Chirazyme L2, c.f., C3, lyo used in this study could exhibit the highest performance in isooctane. The effects of initial water content on the activity and enantioselectivity of the enzymes were also investigated. The method of direct conta...

Journal: :Soft matter 2017
Joonwoo Jeong Yigil Cho Su Yeon Lee Xingting Gong Randall D Kamien Shu Yang A G Yodh

Thin films that exhibit spatially heterogeneous swelling often buckle into the third dimension to minimize stress. These effects, in turn, offer a promising strategy to fabricate complex three-dimensional structures from two-dimensional sheets. Here we employ surface topography as a new means to guide buckling of swollen polymer bilayer films and thereby control the morphology of resulting thre...

2017
Maryna N. Kavalenka Felix Vüllers Jana Kumberg Claudia Zeiger Vanessa Trouillet Sebastian Stein Tanzila T. Ava Chunyan Li Matthias Worgull Hendrik Hölscher

Inspired by the multifunctionality of biological surfaces necessary for the survival of an organism in its specific environment, we developed an artificial special wetting nanofur surface which can be adapted to perform different functionalities necessary to efficiently separate oil and water for cleaning accidental oil spills or separating industrial oily wastewater. Initial superhydrophobic n...

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